<!DOCTYPE html>
<head>
  <title>Below-viewport loading=lazy not-rendered images should never load,
         even when scrolled into view</title>
  <link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">
  <link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="../resources/common.js"></script>
</head>

<body>
  <!-- These images must not attempt to load when scrolled into the
       viewport -->
  <img id="display_none" style="display:none;" src="resources/image.png?2" loading="lazy"
       onload="display_none_img.resolve();" onerror="display_none_img.reject();">
  <img id="attribute_hidden" hidden src="resources/image.png?3" loading="lazy"
       onload="attribute_hidden_img.resolve();" onerror="attribute_hidden_img.reject();">
  <img id="js_display_none" src="resources/image.png?4" loading="lazy"
       onload="js_display_none_img.resolve();" onerror="js_display_none_img.reject();">
  <script>
    document.getElementById("js_display_none").style = 'display:none;';
  </script>

  <!-- Later in the test we'll scroll to this div, instead of the above images,
       since due to them not being rendered, they cannot be scrolled to -->
  <div id="rendered_div"></div>
</body>

<script>
  const display_none_img = new ElementLoadPromise("display_none");
  const attribute_hidden_img = new ElementLoadPromise("attribute_hidden");
  const js_display_none_img = new ElementLoadPromise("js_display_none");
  const rendered_div_element = document.querySelector('#rendered_div');

  async_test(t => {
    window.addEventListener("load", t.step_func(() => {
      rendered_div.scrollIntoView();
    }));

    const unreached_not_rendered_img_func =
      t.unreached_func("The not-rendered below-viewport loading=lazy images " +
                       "should not attempt to load.");

    display_none_img.promise
      .then(unreached_not_rendered_img_func)
      .catch(unreached_not_rendered_img_func);

    attribute_hidden_img.promise
      .then(unreached_not_rendered_img_func)
      .catch(unreached_not_rendered_img_func);

    js_display_none_img.promise
      .then(unreached_not_rendered_img_func)
      .catch(unreached_not_rendered_img_func);

    // If none of the above images load after being scrolled to within the below
    // timeout, the test passes.
    t.step_timeout(t.done, 2000);
  }, "Below-viewport loading=lazy not-rendered images should never load, " +
     "even when scrolled into view");
</script>

